量化赋能中盘宽基，精筑稳健超额Alpha

Group 1 - The core viewpoint of the article is that index-enhanced ETFs are an innovative product that combines the advantages of index enhancement strategies and ETFs, leading to significant growth in the market [1][68]. - As of October 31, 2025, there are 51 index-enhanced ETFs in the market with a total scale of 95.73 billion, of which 7 ETFs track the CSI 500 index, amounting to 25.92 billion [1][68]. Group 2 - The CSI 500 index consists of 500 stocks with higher market capitalization after excluding the top 300 stocks from the CSI 300 index, providing a diversified industry distribution and currently trading below historical valuation averages [2][70]. - The scale of CSI 500 index-enhanced funds reached 493.46 billion by Q3 2025, accounting for over one-fifth of all enhanced funds, with stable excess returns [1][70]. Group 3 - The Bosera CSI 500 Enhanced Strategy ETF (159678.SZ) was launched on February 27, 2023, and aims to achieve returns exceeding the benchmark index through quantitative enhancement strategies [1][71]. - Since its inception, the fund has achieved an annualized excess return of 7.76% with a tracking error of only 3.84%, indicating strong risk-adjusted performance [1][71].